Firefox 47 worked around this by disabling the dark theme entirely.
Firefox 55 beta supports two new independent about:config settings, widget.chrome.allow-gtk-dark-theme and widget.content.allow-gtk-dark-theme (https://bugzilla.mozilla.org/show_bug.cgi?id=1158076). The former gets you a dark-themed UI without messing up web page content.
Firefox 47 worked around this by disabling the dark theme entirely.
Firefox 55 beta supports two new independent about:config settings, widget. chrome. allow-gtk- dark-theme and widget. content. allow-gtk- dark-theme (https:/ /bugzilla. mozilla. org/show_ bug.cgi? id=1158076). The former gets you a dark-themed UI without messing up web page content.
Official PPA for Firefox beta, if you don’t want to wait: https:/ /launchpad. net/~mozillatea m/+archive/ ubuntu/ firefox- next